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2002 Mercedes-Benz C240 Question: Engine Misfires

 

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mustafatel, West Haven, CT, October 29, 2010, 07:45
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 Enthusiast

My car when I drive it over 85 MPH the check Engine light comes up for Engine mis fire, why is that happening?

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, October 29, 2010, 09:06
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     Master

    If the Check Engine Light/Service Engine Soon light illuminates while you are driving, the car's on board computer sees a fault in the engines management system that is causing an excess amount of pollutants to be emitted from your car. This could result in engine damage if left neglected. Some problems that can cause the Check Engine light to stay on may take two "drive cycles' to complete before illuminating the Check Engine Light. The computer sees a problem and looks for an identical set of circumstances to occur to confirm that it has indeed seen a problem before turning on the light. A Check Engine light that continually flashes while you are driving is serious and is a sign that the computer sees a problem that seriously risks damaging the catalytic converter which may result in an expensive repair or even may cause a fire! Diagnostic codes are stored in the vehicle's computer and can be retrieved using a scantool that communicates with the computer in your car. We have in our Repairpal website an encyclopedia with in depth articles about computer, and computer control systems, emission and driveability problems. http://repairpal.com/check-engine-light
    You will need to retrieve the codes stored in the computer in your car to narrow down where the problem is or what cylinder or cylinders are mis firing.

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    mustafatel, October 29, 2010, 12:29
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     Enthusiast

    the first time it was number 1 and the second time it was 2 and 6 it's random.

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